Systems and methods for projecting content from computing devices

ABSTRACT

Systems and methods are provided that enable an alternate display device to wirelessly receive content from a computing device, freeing users from the burden of physically connecting the computing device via a cable. The content sent to the display device can also be simultaneously or separately viewed on the computing devices of other nearby computing devices. Generic mechanism(s) and corresponding user interfaces are provided for computing devices to engage in discovery of devices to which content may be delivered, for accepting delivery and for initiating transmission of content.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.60/514,338, filed Oct. 24, 2003, entitled “Systems and Methods forProjecting Content from Computing Devices”, which is incorporated byreference herein in its entirety. This application is related tocommonly assigned copending U.S. patent application Ser. No. 10/786,833,filed Feb. 25, 2004, entitled “Systems and Methods for ProjectingContent from Computing Devices,” U.S. patent application Ser. No.10/179,431, filed Jun. 25, 2002, entitled “Data Projection System andMethod,” and U.S. patent application Ser. No. 10/692,384, filed Oct. 23,2003, entitled “One to Many Data Projection System and Method.”

COPYRIGHT NOTICE AND PERMISSION

A portion of the disclosure of this patent document may contain materialthat is subject to copyright protection. The copyright owner has noobjection to the facsimile reproduction by anyone of the patent documentor the patent disclosure, as it appears in the Patent and TrademarkOffice patent files or records, but otherwise reserves all copyrightrights whatsoever. The following notice shall apply to this document:Copyright © 2003, Microsoft Corp.

FIELD OF THE INVENTION

This invention relates to systems, methods and user interfaces forenabling wireless projection of content from a computing device to analternate display, such as a projector.

BACKGROUND

Personal computers and portable/mobile computing devices, such as laptopcomputers, Tablet computers, notebook computers, sub-notebook computersand handheld computing devices, etc., as well as other present andfuture variants of portable/mobile computing devices, are sometimes usedto transmit content to a third party device for manipulation orrendering. Such portable or mobile computing devices will be referred toherein simply as “mobile computing devices” or “mobile devices” withoutlimitation. For instance, mobile devices can be used in situations, suchas meetings, to display a presentation on a display, such as a largeformat display surface, e.g., projector or monitor, in the meetingenvironment. Currently, when such a situation arises, users makingpresentations using a mobile computer physically connect theportable/mobile computer via a cable to the projector or to anintermediate electronic system that controls the projector. However,laptop users wanting to present in a conference room must sit close tothe projector control and swap VGA, and possibly also audio cables topresent. The cord is typically not long enough and causes a musicalchairs effect between every presentation as people move around to getthe right person close enough to plug in their laptop. A user may thenhave to adjust screen resolution and/or audio settings each time a newpresenter takes control of the projector display. In addition, usersideally want to project their display not just to the conference roomprojector but also to the laptops of various attendees in the meetingroom.

The need to physically connect a cable, however, is undesirable for avariety of reasons. First, it requires a user with the mobile computingdevice to know that the mobile computing device can connect and also howto connect the mobile computing device, i.e., to know that their mobilecomputing device includes a connector or port for receiving theprojector cable, and that such a connection plus some combination ofobscure keystrokes (e.g., function key plus F5 key) switches the outputof the portable or mobile computing device from the ordinary display ofthe mobile computing device to the port. Secondly, anytime one or morephysical steps are introduced in a computing process, the time it takesto complete the process increases. For instance, a user must bring themobile device to the cable, connect the cable, and secure the connectionso that disconnection does not happen easily. Moreover, to the extentthat male and female connector components are physical components, theyare subject to abuse, and ordinary wear and tear. For instance, oftenthe pins of a connector can become bent, damaged, metal fatigued, etc.in which case the connector components, either male or female, may nolonger function properly.

In addition, the content/data that is ultimately sent to the projectorcannot be simultaneously viewed on the computers of meeting attendees.While wireless technology is rapidly gathering momentum in themarketplace, currently, there is no generic mechanism for receivingwireless data by a display, such as a projector. Moreover, there is nogeneric mechanism for a mobile device to wirelessly transmit content toa display, such as a projector. Still further, there is no genericmechanism for third party computing devices to receive content.

Accordingly, there is a need in the art to add wireless technology toprojectors to allow easy access for mobile users, enabling the abilityto bring together a plurality of mobile users into the same room forcollaborative meetings and providing a seamless connection where a wiredsolution is not practical. Furthermore, there is a need in the art toremove issues associated with cabling, making projectors easier toinstall and tidier, without signal degradation over longer distances.Moreover, there is a need in the art to switch between multiple mobiledevice sources, for example, if multiple people are presenting fromtheir mobile devices. It would be still further desirable to provide amechanism and corresponding user interface to allow users to findavailable wireless projectors or other computers, change or enablesettings and connect specified content to them. Similarly, on thereceiving side, it would be desirable to include a mechanism andcorresponding user interface for users of other computers to accept“projected” content/data from a source mobile computer.

SUMMARY OF THE INVENTION

In consideration of the above-identified shortcomings of the art, thepresent invention provides systems and methods that enable an alternatedisplay device to wirelessly receive content from a computing device,freeing users from the burden of physically connecting the computingdevice via a cable. In another aspect, the content capable of being sentto the display device can also be simultaneously or separately viewed onthe computing devices of other nearby computing devices. In variousembodiments, the invention includes generic mechanism(s) andcorresponding user interfaces for computing devices to engage indiscovery of devices to which content may be delivered, for acceptingdelivery of the content where appropriate and for initiatingtransmission of content.

Other advantages and features of the invention are described below.

BRIEF DESCRIPTION OF THE DRAWINGS

The systems and methods for wirelessly projecting content in accordancewith the present invention are further described with reference to theaccompanying drawings in which:

FIG. 1 is an exemplary block diagram illustrating a typical prior artscenario;

FIG. 2A is a block diagram representing an exemplary network environmenthaving a variety of computing devices in which the present invention maybe implemented;

FIGS. 2B and 2C are block diagrams representing exemplary non-limitingcomputing devices in which the present invention may be implemented;

FIG. 3 illustrates an exemplary sequence for launching a wirelessprojection application in accordance with the invention;

FIGS. 4A and 4B illustrate an exemplary architecture utilized inconnection with the present invention;

FIG. 5 illustrates an exemplary flow diagram relating to the process forconnecting to an alternate display device;

FIG. 6 illustrates an exemplary flow diagram relating to the process forcontrolling an alternate display device;

FIGS. 7A-7H illustrate exemplary non-limiting screenshots of varioususer interface scenarios in accordance with the invention; and

FIGS. 8A-8C illustrate exemplary non-limiting screenshots of variousscenarios illustrating a distinction between public and private contentin accordance with the invention.

DETAILED DESCRIPTION OF THE INVENTION Overview

The invention is directed to systems and methods that enable a displaydevice, such as a projector or large display monitor, to wirelesslyreceive content from a computing device, freeing users from the burdenof physically connecting the computing device via a cable. In anotheraspect, the content capable of being sent to the display device can alsobe simultaneously or separately viewed on the computing devices of othernearby computing devices. In various embodiments, a projector isprovided with wireless functionality, allowing computing devices towirelessly transmit content in turn to the projector, e.g., useful forcollaborative meetings and conference presentations. Since cablingissues are removed, the projector is easier to install, there is nocontent degradation over significant distances and switching betweenmultiple computing device sources is facilitated. Accordingly, contentpresenters can be more mobile within the signaling capabilities ofwireless technologies, without being tied to physical locations such as“near the projector” or “near a wall socket.”

Definitions

The following definitions should be considered an aid in considering oneor more terms utilized herein, but not intended to limit the broadermeanings of any of the terms as understood by one of ordinary skill inthe art.

Wi-Fi (Wireless Fidelity): Wi-Fi technology provides networking usingradio technology. Wi-Fi networks operate in the unlicensed 2.4 to 5 GHzradio bands, which has the capacity to transfers data at 11 Mbps, buttypically delivers 7 Mbps of real data throughput. This providesperformance similar to the basic 10 Base-T wired Ethernet networks usedin many offices. Alternate display devices in accordance with theinvention include, but are not limited, to Wi-Fi 802.11b technology,currently the most common form of wireless communication in theprojector and computer industry.

Peer-to-Peer (Ad Hoc): Wireless configuration in which one or morecomputers can share a projector equipped with the same wirelesscapability. Peer-to peer implies that each projector user has the samecapabilities and each user can initiate a communication session with theprojector (or theoretically each other). Ad hoc is Latin meaning ‘forthis’ or ‘for this purpose only,’ implying a temporary or spontaneousarrangement, as is the case of mobile wireless computers that come andgo from a presentation room. This arrangement allows equal access forall users and thus collaborative meetings or shared presentations arepossible.

Alternate Display Device, or Projector Device: The projector device usesboth Terminal Services and UPnP. The device exposes the methods that aMRM device uses to control the device and establish a connection viaTerminal Services. This could be an actual projector or another device,such as a laptop, hooked to a projector.

RA: Remote Assistance.

Terminal Services (TS): Terminal Services is responsible for theprotocol used to “stream” the screen of the user.

UPnP Device Host and Control Point: The Universal Plug and Play (UPnP)protocol is used for discovery of the device. In addition, the device ishosted within the UPnP Device Host service.

RDP Salem Layer: The RDP Salem Layer understands the Remote Assistance“tickets” used for establishing a connection.

Salem Layer for TS: Salem Layer is a current ticket generation layer forRemote Assistance.

Exemplary Networked and Distributed Environments

One of ordinary skill in the art can appreciate that the invention canbe implemented in connection with any computer or other client or serverdevice, which can be deployed as part of a computer network, or in adistributed computing environment. In this regard, the present inventionpertains to any computer system or environment having any number ofmemory or storage units, and any number of applications and processesoccurring across any number of storage units or volumes, which may beused in connection with wireless transmission of content in accordancewith the present invention. The present invention may apply to anenvironment with server computers and client computers deployed in anetwork environment or distributed computing environment, having remoteor local storage. The present invention may also be applied tostandalone computing devices, having programming language functionality,interpretation and execution capabilities for generating, receiving andtransmitting information in connection with remote or local services.With network sources for digital media proliferating more than ever, theinvention is particularly relevant to those computing devices operatingin a network or distributed computing environment, and thus thetransmission techniques in accordance with the present invention can beapplied with great efficacy in those environments.

Distributed computing provides sharing of computer resources andservices by exchange between computing devices and systems. Theseresources and services include the exchange of information, cachestorage and disk storage for files. Distributed computing takesadvantage of network connectivity, allowing clients to leverage theircollective power and storage to benefit the entire enterprise. In thisregard, a variety of devices may have applications, objects or resourcesthat may implicate the ability to wirelessly project content via theinvention.

FIG. 2A provides a schematic diagram of an exemplary networked ordistributed computing environment. The distributed computing environmentcomprises computing objects 10 a, 10 b, etc. and computing objects ordevices 110 a, 110 b, 110 c, etc. These objects may comprise programs,methods, data stores, programmable logic, etc. The objects may compriseportions of the same or different devices such as PDAs, audio/videodevices, MP3 players, personal computers, etc. Each object cancommunicate with another object by way of the communications network 14.This network may itself comprise other computing objects and computingdevices that provide services to the system of FIG. 2A, and may itselfrepresent multiple interconnected networks. In accordance with an aspectof the invention, each of the objects 10 a, 10 b, etc. or 110 a, 110 b,110 c, etc. may contain an application that might make use of aninterface, such as an API, or other object, software, firmware and/orhardware, to request or make use of the wireless content projectionprocesses in accordance with the invention.

It can also be appreciated that an object, such as 110 c, may be hostedon another computing device 10 a, 10 b, etc. or 110 a, 110 b, etc. Thus,although the physical environment depicted may show the connecteddevices as computers, such illustration is merely exemplary and thephysical environment may alternatively be depicted or describedcomprising various digital devices such as PDAs, televisions, MP3players, etc., software objects such as interfaces, COM objects, or anydevice that may be utilized in connection with a media experience.

There are a variety of systems, components, and network configurationsthat support distributed computing environments. For example, computingsystems may be connected together by wired or wireless systems, by localnetworks or widely distributed networks. Currently, many of the networksare coupled to the Internet, which provides an infrastructure for widelydistributed computing and encompasses many different networks. Any ofthe infrastructures may be used for exemplary communications madeincident to the provision of wireless content projection according tothe present invention.

In home networking environments, there are at least four disparatenetwork transport media that may each support a unique protocol, such asPower line, data (both wireless and wired), voice (e.g., telephone) andentertainment media. Most home control devices such as light switchesand appliances may use power lines for connectivity. Data Services mayenter the home as broadband (e.g., either DSL or Cable modem) and areaccessible within the home using either wireless (e.g., HomeRF or802.11B) or wired (e.g., Home PNA, Cat 5, Ethernet, even power line)connectivity. Voice traffic may enter the home either as wired (e.g.,Cat 3) or wireless (e.g., cell phones) and may be distributed within thehome using Cat 3 wiring. Entertainment media, or other graphical data,may enter the home either through satellite or cable and is typicallydistributed in the home using coaxial cable. IEEE 1394 and DVI are alsodigital interconnects for clusters of media devices. All of thesenetwork environments and others that may emerge as protocol standardsmay be interconnected to form a network, such as an intranet, that maybe connected to the outside world by way of the Internet. In short, avariety of disparate sources exist for the storage and transmission ofdata, and consequently, moving forward, computing devices will requireways of sharing data, such as data accessed or utilized incident toprogram objects, which request or make use of the wireless contenttransmission mechanism(s) in accordance with the present invention.

The Internet commonly refers to the collection of networks and gatewaysthat utilize the TCP/IP suite of protocols, which are well-known in theart of computer networking. TCP/IP is an acronym for “TransmissionControl Protocol/Internet Protocol.” The Internet can be described as asystem of geographically distributed remote computer networksinterconnected by computers executing networking protocols that allowusers to interact and share information over the network(s). Because ofsuch wide-spread information sharing, remote networks such as theInternet have thus far generally evolved into an open system for whichdevelopers can design software applications for performing specializedoperations or services, essentially without restriction.

Thus, the network infrastructure enables a host of network topologiessuch as client/server, peer-to-peer, or hybrid architectures. The“client” is a member of a class or group that uses the services ofanother class or group to which it is not related. Thus, in computing, aclient is a process, i.e., roughly a set of instructions or tasks, thatrequests a service provided by another program. The client processutilizes the requested service without having to “know” any workingdetails about the other program or the service itself. In aclient/server architecture, particularly a networked system, a client isusually a computer that accesses shared network resources provided byanother computer, e.g., a server. In the example of FIG. 2A, computers110 a, 110 b, etc. can be thought of as clients and computers 10 a, 10b, etc. can be thought of as the server where server 10 a, 10 b, etc.maintains the data that is then replicated in the client computers 120a, 110 b, etc., although any computer can be considered a client, aserver, or both, depending on the circumstances. For instance, computer110 a may be a laptop, and computing devices 10 a, 10 b, etc. may beremote media devices, or alternate display devices. Any of thesecomputing devices may be processing data or requesting services or tasksthat may implicate the wireless transmission/reception of content inaccordance with the invention.

A server is typically a remote computer system accessible over a remoteor local network, such as the Internet. The client process may be activein a first computer system, and the server process may be active in asecond computer system, communicating with one another over acommunications medium, thus providing distributed functionality andallowing multiple clients to take advantage of the information-gatheringcapabilities of the server. Any software objects utilized pursuant tothe invention may be distributed across multiple computing devices orobjects.

Client(s) and server(s) communicate with one another utilizing thefunctionality provided by protocol layer(s). For example, HyperTextTransfer Protocol (HTTP) is a common protocol that is used inconjunction with the World Wide Web (WWW), or “the Web.” For instance,remote desktop protocol (RDP) is a common protocol utilized for remotecomputing. Typically, a computer network address such as an InternetProtocol (IP) address or other reference such as a Universal ResourceLocator (URL) can be used to identify the server or client computers toeach other. The network address can be referred to as a URL address.Communication can be provided over a communications medium, e.g.,client(s) and server(s) may be coupled to one another via TCP/IPconnection(s) for high-capacity communication.

Thus, FIG. 2A illustrates an exemplary networked or distributedenvironment, with a server in communication with client computers via anetwork/bus, in which the present invention may be employed. In moredetail, a number of servers 10 a, 10 b, etc., are interconnected via acommunications network/bus 14, which may be a LAN, WAN, intranet, theInternet, etc., with a number of client or remote computing devices 110a, 110 b, 110 c, 110 d, 110 e, etc., such as a portable computer,handheld computer, thin client, networked appliance, or other device,such as a VCR, TV, oven, light, heater and the like in accordance withthe present invention. It is thus contemplated that the presentinvention may apply to any computing device having media abilities whenit comes to storage, creation, user interface, rendering, etc.

In a network environment in which the communications network/bus 14 isthe Internet, for example, the servers 10 a, 10 b, etc. can be Webservers with which the clients 110 a, 110 b, 110 c, 110 d, 110 e, etc.communicate via any of a number of known protocols such as HTTP. Servers10 a, 10 b, etc. may also serve as clients 110 a, 110 b, 110 c, 110 d,110 e, etc., as may be characteristic of a distributed computingenvironment.

Communications may be wired or wireless, where appropriate. Clientdevices 110 a, 110 b, 110 c, 110 d, 110 e, etc. may or may notcommunicate via communications network/bus 14, and may have independentcommunications associated therewith. For example, in the case of a TV orVCR, there may or may not be a networked aspect to the control thereof.Each client computer 110 a, 110 b, 110 c, 110 d, 110 e, etc. and servercomputer 10 a, 10 b, etc. may be equipped with various applicationprogram modules or objects 135 and with connections or access to varioustypes of storage elements or objects, across which files or data streamsmay be stored or to which portion(s) of files or data streams may bedownloaded, transmitted or migrated. Any one or more of computers 10 a,10 b, 110 a, 110 b, etc. may be responsible for the maintenance andupdating of a database 20 or other storage element, such as a databaseor memory 20 for storing data processed according to the invention.Thus, the present invention can be utilized in a computer networkenvironment having client computers 110 a, 110 b, etc. that can accessand interact with a computer network/bus 14 and server computers 10 a,10 b, etc. that may interact with client computers 110 a, 110 b, etc.and other like devices, and databases 20.

Exemplary Computing Device

FIG. 2B and the following discussion are intended to provide a briefgeneral description of a suitable computing environment in connectionwith which the invention may be implemented. It should be understood,however, that handheld, portable and other computing devices andcomputing objects of all kinds are contemplated for use in connectionwith the present invention, i.e., anywhere where that media may beexperienced in a computing environment. While a general purpose computeris described below as an exemplary host, this is but one example, andthe present invention may be implemented with a thin client havingnetwork/bus interoperability and interaction. Thus, the presentinvention may be implemented in an environment of networked hostedservices in which very little or minimal client resources areimplicated, e.g., a networked environment in which the client deviceserves merely as an interface to the network/bus, such as an objectplaced in an appliance. In essence, anywhere that data or content may bestored or from which data may be retrieved or transmitted to anothercomputer is a desirable, or suitable, environment for operation of thewireless delivery of content in accordance with the invention.

Although not required, the invention can be implemented via an operatingsystem, for use by a developer of services for a device or object,and/or included within application software that operates in connectionwith the wireless delivery of content in accordance with the invention.Software may be described in the general context of computer-executableinstructions, such as program modules, being executed by one or morecomputers, such as client workstations, servers or other devices.Generally, program modules include routines, programs, objects,components, data structures and the like that perform particular tasksor implement particular abstract data types. Typically, thefunctionality of the program modules may be combined or distributed asdesired in various embodiments. Moreover, those skilled in the art willappreciate that the invention may be practiced with other computersystem configurations and protocols. Other well known computing systems,environments, and/or configurations that may be suitable for use withthe invention include, but are not limited to, personal computers (PCs),automated teller machines, server computers, hand-held or laptopdevices, multi-processor systems, microprocessor-based systems,programmable consumer electronics, network PCs, appliances, lights,environmental control elements, minicomputers, mainframe computers andthe like. The invention may also be practiced in distributed computingenvironments where tasks are performed by remote processing devices thatare linked through a communications network/bus or other datatransmission medium. In a distributed computing environment, programmodules may be located in both local and remote computer storage mediaincluding memory storage devices, and client nodes may in turn behave asserver nodes.

FIG. 2B thus illustrates an example of a suitable computing systemenvironment 100 in which the invention may be implemented, although asmade clear above, the computing system environment 100 is only oneexample of a suitable computing environment and is not intended tosuggest any limitation as to the scope of use or functionality of theinvention. Neither should the computing environment 100 be interpretedas having any dependency or requirement relating to any one orcombination of components illustrated in the exemplary operatingenvironment 100.

With reference to FIG. 2B, an exemplary system for implementing theinvention includes a general purpose computing device in the form of acomputer 110. Components of computer 110 may include, but are notlimited to, a processing unit 120, a system memory 130, and a system bus121 that couples various system components including the system memoryto the processing unit 120. The system bus 121 may be any of severaltypes of bus structures including a memory bus or memory controller, aperipheral bus, and a local bus using any of a variety of busarchitectures. By way of example, and not limitation, such architecturesinclude Industry Standard Architecture (ISA) bus, Micro ChannelArchitecture (MCA) bus, Enhanced ISA (EISA) bus, Video ElectronicsStandards Association (VESA) local bus, and Peripheral ComponentInterconnect (PCI) bus (also known as Mezzanine bus).

Computer 110 typically includes a variety of computer readable media.Computer readable media can be any available media that can be accessedby computer 110 and includes both volatile and nonvolatile media,removable and non-removable media. By way of example, and notlimitation, computer readable media may comprise computer storage mediaand communication media. Computer storage media includes both volatileand nonvolatile, removable and non-removable media implemented in anymethod or technology for storage of information such as computerreadable instructions, data structures, program modules or other data.Computer storage media includes, but is not limited to, RAM, ROM,EEPROM, flash memory or other memory technology, CDROM, digitalversatile disks (DVD) or other optical disk storage, magnetic cassettes,magnetic tape, magnetic disk storage or other magnetic storage devices,or any other medium which can be used to store the desired informationand which can be accessed by computer 110. Communication media typicallyembodies computer readable instructions, data structures, programmodules or other data in a modulated data signal such as a carrier waveor other transport mechanism and includes any information deliverymedia. The term “modulated data signal” means a signal that has one ormore of its characteristics set or changed in such a manner as to encodeinformation in the signal. By way of example, and not limitation,communication media includes wired media such as a wired network ordirect-wired connection, and wireless media such as acoustic, RF,infrared and other wireless media. Combinations of any of the aboveshould also be included within the scope of computer readable media.

The system memory 130 includes computer storage media in the form ofvolatile and/or nonvolatile memory such as read only memory (ROM) 131and random access memory (RAM) 132. A basic input/output system 133(BIOS), containing the basic routines that help to transfer informationbetween elements within computer 110, such as during start-up, istypically stored in ROM 131. RAM 132 typically contains data and/orprogram modules that are immediately accessible to and/or presentlybeing operated on by processing unit 120. By way of example, and notlimitation, FIG. 2B illustrates operating system 134, applicationprograms 135, other program modules 136, and program data 137.

The computer 110 may also include other removable/non-removable,volatile/nonvolatile computer storage media. By way of example only,FIG. 2B illustrates a hard disk drive 141 that reads from or writes tonon-removable, nonvolatile magnetic media, a magnetic disk drive 151that reads from or writes to a removable, nonvolatile magnetic disk 152,and an optical disk drive 155 that reads from or writes to a removable,nonvolatile optical disk 156, such as a CD-ROM or other optical media.Other removable/non-removable, volatile/nonvolatile computer storagemedia that can be used in the exemplary operating environment include,but are not limited to, magnetic tape cassettes, flash memory cards,digital versatile disks, digital video tape, solid state RAM, solidstate ROM and the like. The hard disk drive 141 is typically connectedto the system bus 121 through a non-removable memory interface such asinterface 140, and magnetic disk drive 151 and optical disk drive 155are typically connected to the system bus 121 by a removable memoryinterface, such as interface 150.

The drives and their associated computer storage media discussed aboveand illustrated in FIG. 2B provide storage of computer readableinstructions, data structures, program modules and other data for thecomputer 110. In FIG. 2B, for example, hard disk drive 141 isillustrated as storing operating system 144, application programs 145,other program modules 146 and program data 147. Note that thesecomponents can either be the same as or different from operating system134, application programs 135, other program modules 136 and programdata 137. Operating system 144, application programs 145, other programmodules 146 and program data 147 are given different numbers here toillustrate that, at a minimum, they are different copies. A user mayenter commands and information into the computer 110 through inputdevices such as a keyboard 162 and pointing device 161, commonlyreferred to as a mouse, trackball or touch pad. Other input devices (notshown) may include a microphone, joystick, game pad, satellite dish,scanner, or the like. These and other input devices are often connectedto the processing unit 120 through a user input interface 160 that iscoupled to the system bus 121, but may be connected by other interfaceand bus structures, such as a parallel port, game port or a universalserial bus (USB). A graphics interface 182, such as Northbridge, mayalso be connected to the system bus 121. Northbridge is a chipset thatcommunicates with the CPU, or host processing unit 120, and assumesresponsibility for accelerated graphics port (AGP) communications. Oneor more graphics processing units (GPUs) 184 may communicate withgraphics interface 182. In this regard, GPUs 184 generally includeon-chip memory storage, such as register storage and GPUs 184communicate with a video memory 186, wherein the application variablesof the invention may have impact. GPUs 184, however, are but one exampleof a coprocessor and thus a variety of coprocessing devices may beincluded in computer 110, and may include a variety of proceduralshaders, such as pixel and vertex shaders. A monitor 191 or other typeof display device is also connected to the system bus 121 via aninterface, such as a video interface 190, which may in turn communicatewith video memory 186. In addition to monitor 191, computers may alsoinclude other peripheral output devices such as speakers 197 and printer196, which may be connected through an output peripheral interface 195.

The computer 110 may operate in a networked or distributed environmentusing logical connections to one or more remote computers, such as aremote computer 180. The remote computer 180 may be a personal computer,a server, a router, a network PC, a peer device or other common networknode, and typically includes many or all of the elements described aboverelative to the computer 110, although only a memory storage device 181has been illustrated in FIG. 2B. The logical connections depicted inFIG. 2B include a local area network (LAN) 171 and a wide area network(WAN) 173, but may also include other networks/buses. Such networkingenvironments are commonplace in homes, offices, enterprise-wide computernetworks, intranets and the Internet.

When used in a LAN networking environment, the computer 110 is connectedto the LAN 171 through a network interface or adapter 170. When used ina WAN networking environment, the computer 110 typically includes amodem 172 or other means for establishing communications over the WAN173, such as the Internet. The modem 172, which may be internal orexternal, may be connected to the system bus 121 via the user inputinterface 160, or other appropriate mechanism. In a networkedenvironment, program modules depicted relative to the computer 110, orportions thereof, may be stored in the remote memory storage device. Byway of example, and not limitation, FIG. 2B illustrates remoteapplication programs 185 as residing on memory device 181. It will beappreciated that the network connections shown are exemplary and othermeans of establishing a communications link between the computers may beused.

Exemplary Alternate Devices

As mentioned, the invention applies to any device wherein it may bedesirable to wirelessly project content from one computing device to thedisplay of another computing device. FIG. 2C and the followingdiscussion are thus intended to supplement the general description ofFIG. 2B. It should be understood, therefore, that handheld, portable andother computing devices and computing objects of all kinds arecontemplated for use in connection with the present invention, i.e.,anywhere that a device may wish to wirelessly deliver content to analternate display. Accordingly, the below general purpose remotecomputer described below is but one example, and the present inventionmay be implemented with any client having network/bus interoperabilityand interaction. Thus, the present invention may be implemented in anenvironment of networked hosted services in which very little or minimalclient resources are implicated, e.g., a networked environment in whichthe client device serves merely as an interface to the network/bus, suchas an object placed in an appliance.

Although not required, the invention can partly be implemented via anoperating system, for use by a developer of services for a device orobject, and/or included within application software that operates inconnection with the component(s) of the invention. Software may bedescribed in the general context of computer-executable instructions,such as program modules, being executed by one or more computers, suchas client workstations, servers or other devices. Those skilled in theart will appreciate that the invention may be practiced with othercomputer system configurations and protocols.

FIG. 2C thus illustrates an example of a suitable computing systemenvironment 100 a in which the invention may be implemented, although asmade clear above, the computing system environment 100 a is only oneexample of a suitable computing environment for a media device and isnot intended to suggest any limitation as to the scope of use orfunctionality of the invention. Neither should the computing environment100 be interpreted as having any dependency or requirement relating toany one or combination of components illustrated in the exemplaryoperating environment 100 a.

With reference to FIG. 2C, an exemplary remote device for implementingthe invention includes a general purpose computing device in the form ofa computer 110 a. Components of computer 110 a may include, but are notlimited to, a processing unit 120 a, a system memory 130 a, and a systembus 121 a that couples various system components including the systemmemory to the processing unit 120 a. The system bus 121 a may be any ofseveral types of bus structures including a memory bus or memorycontroller, a peripheral bus, and a local bus using any of a variety ofbus architectures.

Computer 110 a typically includes a variety of computer readable media.Computer readable media can be any available media that can be accessedby computer 110 a. By way of example, and not limitation, computerreadable media may comprise computer storage media and communicationmedia. Computer storage media includes both volatile and nonvolatile,removable and non-removable media implemented in any method ortechnology for storage of information such as computer readableinstructions, data structures, program modules or other data. Computerstorage media includes, but is not limited to, RAM, ROM, EEPROM, flashmemory or other memory technology, CDROM, digital versatile disks (DVD)or other optical disk storage, magnetic cassettes, magnetic tape,magnetic disk storage or other magnetic storage devices, or any othermedium which can be used to store the desired information and which canbe accessed by computer 110. Communication media typically embodiescomputer readable instructions, data structures, program modules orother data in a modulated data signal such as a carrier wave or othertransport mechanism and includes any information delivery media.

The system memory 130 a may include computer storage media in the formof volatile and/or nonvolatile memory such as read only memory (ROM)and/or random access memory (RAM). A basic input/output system (BIOS),containing the basic routines that help to transfer information betweenelements within computer 110, such as during start-up, may be stored inmemory 130 a. Memory 130 a typically also contains data and/or programmodules that are immediately accessible to and/or presently beingoperated on by processing unit 120 a. By way of example, and notlimitation, memory 130 a may also include an operating system,application programs, other program modules, and program data.

The computer 110 a may also include other removable/non-removable,volatile/nonvolatile computer storage media. For example, computer 110 acould include a hard disk drive that reads from or writes tonon-removable, nonvolatile magnetic media, a magnetic disk drive thatreads from or writes to a removable, nonvolatile magnetic disk, and/oran optical disk drive that reads from or writes to a removable,nonvolatile optical disk, such as a CD-ROM or other optical media. Otherremovable/non-removable, volatile/nonvolatile computer storage mediathat can be used in the exemplary operating environment include, but arenot limited to, magnetic tape cassettes, flash memory cards, digitalversatile disks, digital video tape, solid state RAM, solid state ROMand the like. A hard disk drive is typically connected to the system bus121 a through a non-removable memory interface such as an interface, anda magnetic disk drive or optical disk drive is typically connected tothe system bus 121 by a removable memory interface, such as aninterface.

A user may enter commands and information into the computer 110 athrough input devices such as a keyboard and pointing device, commonlyreferred to as a mouse, trackball or touch pad. Other input devices mayinclude a microphone, joystick, game pad, satellite dish, scanner, orthe like. These and other input devices are often connected to theprocessing unit 120 a through user input 140 a and associatedinterface(s) that are coupled to the system bus 121 a, but may beconnected by other interface and bus structures, such as a parallelport, game port or a universal serial bus (USB). A graphics subsystemmay also be connected to the system bus 121 a. A monitor or other typeof display device is also connected to the system bus 121 a via aninterface, such as output interface 150 a, which may in turn communicatewith video memory. In addition to a monitor, computers may also includeother peripheral output devices such as speakers and a printer, whichmay be connected through output interface 150 a.

The computer 110 a may operate in a networked or distributed environmentusing logical connections to one or more other remote computers, such asremote computer 170 a, which may in turn have media capabilitiesdifferent from device 110 a. The remote computer 170 a may be a personalcomputer, a server, a router, a network PC, a peer device or othercommon network node, or any other remote media consumption ortransmission device, and may include any or all of the elementsdescribed above relative to the computer 110 a. The logical connectionsdepicted in FIG. 2C include a network 171 a, such local area network(LAN) or a wide area network (WAN), but may also include othernetworks/buses. Such networking environments are commonplace in homes,offices, enterprise-wide computer networks, intranets and the Internet.

When used in a LAN networking environment, the computer 110 a isconnected to the LAN 171 a through a network interface or adapter. Whenused in a WAN networking environment, the computer 110 a typicallyincludes a modem or other means for establishing communications over theWAN, such as the Internet. A modem, which may be internal or external,may be connected to the system bus 121 a via the user input interface ofinput 140 a, or other appropriate mechanism. In a networked environment,program modules depicted relative to the computer 110 a, or portionsthereof, may be stored in a remote memory storage device. It will beappreciated that the network connections shown and described areexemplary and other means of establishing a communications link betweenthe computers may be used.

Exemplary Distributed Computing Frameworks or Architectures

Various distributed computing frameworks have been and are beingdeveloped in light of the convergence of personal computing and theInternet. Individuals and business users alike are provided with aseamlessly interoperable and Web-enabled interface for applications andcomputing devices, making computing activities increasingly Web browseror network-oriented.

For example, MICROSOFT®'s managed code platform, i.e., .NET, includesservers, building-block services, such as Web-based data storage anddownloadable device software. Generally speaking, the .NET platformprovides (1) the ability to make the entire range of computing deviceswork together and to have user information automatically updated andsynchronized on all of them, (2) increased interactive capability forWeb pages, enabled by greater use of XML rather than HTML, (3) onlineservices that feature customized access and delivery of products andservices to the user from a central starting point for the management ofvarious applications, such as e-mail, for example, or software, such asOffice .NET, (4) centralized data storage, which increases efficiencyand ease of access to information, as well as synchronization ofinformation among users and devices, (5) the ability to integratevarious communications media, such as e-mail, faxes, and telephones, (6)for developers, the ability to create reusable modules, therebyincreasing productivity and reducing the number of programming errorsand (7) many other cross-platform and language integration features aswell.

While some exemplary embodiments herein are described in connection withsoftware residing on a computing device, one or more portions of theinvention may also be implemented via an operating system, applicationprogramming interface (API) or a “middle man” object, a control object,hardware, firmware, intermediate language instructions or objects, etc.,such that the methods of the invention may be included in, supported inor accessed via all of the languages and services enabled by managedcode, such as .NET code, and in other distributed computing frameworksas well.

Overview of Remote Desktop Protocol and Terminal Server Sessions

The Microsoft Remote Desktop Protocol (RDP) is one example of a protocolthat can be used to port a media experience from a host to a remotemedia consumption device. RDP provides remote display and inputcapabilities over network connections for Windows-based applicationsrunning on a server. RDP is designed to support different types ofnetwork topologies and multiple LAN protocols.

On the server, RDP uses its own video driver to render display output byconstructing the rendering information into network packets using theprotocol and sending them over the network to the client. On the client,RDP receives rendering data and interprets the packets intocorresponding graphics device interface API calls. For the input path,client mouse and keyboard events are redirected from the client to theserver. On the server, RDP uses its own virtual keyboard andmouse-driver to receive the keyboard and mouse events. From anon-limiting feature standpoint, RDP includes encryption, bandwidthreduction features, roaming disconnect, clipboard mapping, printredirection, virtual channels, remote control and network loadbalancing.

Terminal Server provides an exemplary remote computing environment as anextension of a server, such as Windows NT Server. With merely a thinclient, users can experience the server desktop operating system andapplications completely off the server. With Terminal Server, users areprovided access to Windows-based applications from any of the followingtypes of desktops: (A) low-cost hardware, commonly referred to asWindows-based terminals, which are marketed by third-party hardwarevendors, (B) Windows desktop operating systems, such as Windows 95 orMicrosoft Windows NT Workstation by running the Terminal Server clientas a window within the local desktop environment, and (C) X-basedTerminals, UNIX-based desktops as well as Apple Macintosh, MS-DOS andother networked computers (through add-on software).

Terminal Server comprises three main components: the Terminal Servermultiuser core, the Remote Desktop Protocol (RDP) and the thin clientsoftware.

Terminal Server is the multiuser server core that provides the abilityto host multiple, simultaneous client sessions on other devices.Terminal Server is capable of directly hosting compatible multiuserclient desktops running on a variety of Windows-based andnon-Windows-based hardware. Standard Windows-based applications do notneed modification to run on the Terminal Server, and all standardWindows NT-based management infrastructure and technologies can be usedto manage the client desktops. In this way, corporations can takeadvantage of the rich choice of applications and tools offered by theWindows environment.

RDP is the protocol of Terminal Server that allows a thin client tocommunicate with the Terminal Server over the network. This protocol isbased on the International Telecommunications Union (ITU) T.120protocol, an international, standard multichannel conferencing protocol.RDP is tuned for high-bandwidth enterprise environments and alsosupports encrypted sessions.

The thin client component is software that presents, or displays, aWindows user interface on a range of desktop hardware includingWindows-based terminal devices and personal computers.

An Object Manager of Terminal Server provides that applications andsystem programs of different sessions do not collide. Every object namecreated within a session is appended with a unique identifier numberassociated with the individual session that created it (SessionID). TheTerminal Server service is entirely protocol-independent, so it canfunction using RDP or a third-party add-on protocol such as Citrix'sICA.

RDP is a multichannel capable protocol allowing for separate virtualchannels for carrying serial device communication and presentation datafrom the server, as well as encrypted client mouse and keyboard data.Virtual channels are software extensions that can be used to addfunctional enhancements to a Terminal Services application. Examples offunctional enhancements might include: support for special types ofhardware, audio, or other additions to the core functionality providedby the Terminal Services RDP. RDP provides multiplexed management ofmultiple virtual channels.

A virtual channel application has two parts, a client-side component anda server-side component. The server-side component is an executableprogram running on the Terminal Server. The client-side component is aDLL that is loaded into memory on the client computer when the TerminalServices client program runs.

Virtual channels can add functional enhancements to a Terminal Servicesclient, independent of the RDP protocol. With virtual channel support,new features can be added without having to update the client or serversoftware, or the RDP protocol.

Several other capabilities are also part of the T.120 standardsdefinition, including, for example, multipoint data delivery, whichallows data from an application to be delivered “real-time” to multipleparties. Multicast-enabled delivery allows for reliable deliveryservices of data transmissions. It increases the performance for thecustomer while at the same time reducing the load on the networkinfrastructure. RDP is beneficial for connectivity purposes because itprovides an extensible base from which to build more abilities. This isin part because RDP provides up to 64,000 separate channels for datatransmission, as well as provisions for multipoint transmission.

RDP is designed to support many different types of Network topologies,such as ISDN, POTS, and many LAN protocols, such as IPX, Netbios,TCP/IP, and so forth.

The activity involved in sending and receiving data through the RDPstack is essentially the same as the seven-layer OSI (open systemsinterconnection) model standards for common LAN networking today. Datafrom an application or service to be transmitted is passed down throughthe protocol stacks, sectioned, directed to a channel, encrypted,wrapped, framed, packaged onto the network protocol, and finallyaddressed and sent over the wire to the client.

The return data works the same way in reverse, with the packet beingstripped of its address, then unwrapped, decrypted, and so on, until thedata is presented to the application for use. Some portions of theprotocol stack modifications occur between the 4th and 7th layers, wherethe data is encrypted, wrapped and framed, directed to a channel, andprioritized.

With RDP, advantageously, the complexities of dealing with the Protocolstack are abstracted away from the application developer. Theapplication developer simply writes the application, and the RDP stackimplemented by the Terminal Server and its client connections takes careof the rest.

When starting, Terminal Server boots and loads the core operatingsystem, and the Terminal Server service is started and begins waitingfor session connections. Each connection is given a unique sessionidentifier or “SessionID,” to represent an individual session to theTerminal Server and each process created within a session is “tagged”with the associated SessionID to differentiate its namespace from othersession namespaces. When a user logs on to a Terminal Services-enabledcomputer, a session is started for the user, identified by uniquesession ID. Because each logon to a Terminal Services client receives aseparate session ID, the user-experience is similar to being logged onto multiple computers at the same time, e.g., an office computer and ahome computer.

The console (Terminal Server keyboard, mouse, and video) session is thefirst to load and is treated as a special-case client connection andassigned SessionID0. The console session starts as a normal systemsession, with the configured display, mouse, and keyboard driversloaded.

After creating the console session, the Terminal Server service thencalls the Session Manager to create two (by default) idle clientsessions awaiting client connections. To create the idle sessions, theSession Manager executes the client server run-time subsystem process,and a new SessionID is assigned to that process.

Unlike the console session, client sessions are configured to loadseparate drivers for the display, keyboard, and mouse. The new displaydriver is the Remote Desktop Protocol (RDP) display device driver, andthe mouse and keyboard drivers are replaced with the RDP driver. Thesedrivers allow the RDP client session to be both available andinteractive, remotely. Finally, Terminal Server also invokes aconnection listener thread for the RDP protocol, which listens for RDPclient connections on a TCP port. Processes with different SessionIDsare prevented from accessing another session's data.

In an exemplary implementation, the client initiates a connection to theTerminal Server through the TCP port. The Terminal Server RDP listenerthread detects the session request and creates a new RDP stack instanceto handle the new session request. The listener thread hands over theincoming session to the new RDP stack instance and continues listeningon the TCP port for further connection attempts. Each RDP stack iscreated as the client sessions are connected to handle negotiation ofsession configuration details.

After user logon, the desktop, or application, if in single applicationmode, is displayed for the user. When the user selects an application torun, the mouse commands are passed to the Terminal Server, whichlaunches the selected application into a new virtual memory space.

If a user decides to disconnect the session, the processes and allvirtual memory space remain and are paged off to the physical disk ifphysical memory is required for other processes. An additional benefitof RDP is that of being able to change session screen resolutions,depending on what the user requests for the session. For example, if auser had previously connected to a Terminal Server session at 800×600resolution and disconnected, and then moved to a different computer thatonly supported 640×480 resolution and reconnected to the existingsession, the desktop would be redrawn to support the new resolution.

Logoff is typically very simple to implement. Once a user logs off fromthe session, all processes associated with the SessionID are terminatedand any memory allocated to the session is released.

Systems and Methods for Wirelessly Transmitting and Receiving Content

In one aspect, the invention enables a display device, such as aprojector or large display monitor, to include wireless technology,allowing the display device to receive content/data from a mobilecomputing device. Thus, users can need not physically connect the mobiledevice to a cable. In another aspect, the content/data that is beingsent to the display device from a mobile device can be simultaneouslyviewed on the computing devices of meeting attendees. Wirelesstechnology is rapidly gathering momentum in the projector marketplace.With a projector manufactured with wireless functionality, such asWi-Fi, in “ad-hoc” mode, projectors allow easy access for mobile usersto provide content. Such a projector provides the ability to bringtogether a plurality of mobile users into the same room, or room(s) nearenough for wireless technology, for collaborative meetings.Additionally, the invention provides an easy connection where a wiredsolution is not practical, i.e., cabling issues are removed.

Thus, with the invention, a projector is easier to install, tidier andthere is no signal loss or degradation over significant distances. Withthe invention, it is also easier to switch between multiple PC sources,for instance, if there are multiple people presenting from their ownlaptops. Accordingly, presenters can be more mobile in the room, orotherwise within the capabilities of wireless technologies, and they donot have to be near the projector or near a wall socket. In oneembodiment of the invention, by including wireless technology, such asWi-Fi, capable of projecting to a projector or other mobile device inthe operating system of a mobile device, the mobile device is able toproject wirelessly without the need for additional installation ofsoftware or hardware to the mobile device.

In one embodiment, the invention leverages wireless technology builtinto projectors and uses Universal Plug and Play (UPnP) to advertise theprojector's presence, users portable/mobile computer to find, andcontrol the projectors. The invention can utilize a Terminal Servicesession to connect the display to the user's machine.

The invention facilitates a great integrated experience betweenportable/mobile computer drives projectors and the displays of otherportable/mobile computers. Adding wireless capability to projectorsallows easy access for mobile users, providing the ability to bringtogether a number of mobile users into the same room for collaborativemeetings, and providing an easy connection where a wired solution is notpractical. Cabling issues are removed, therefore the projector is easierto install, tidier, and there is no signal loss over longer distances.It is much easier to switch between multiple PC sources, especially ifmultiple people are presenting from their own laptops and presenters canbe more mobile in the room—they do not have to be near the projector ornear a wall socket.

One of the main benefits of wireless technology in accordance with theinvention can be seen in a room with multiple presenters, where eachspeaker previously had to plug their laptop into a projector connectionand unplug it when each was finished, i.e., with the invention,collaborative group presentations can be achieved without switchingcables. Three scenarios enabled by the invention include Mirror,Extended Monitor and 1:N. In an exemplary Mirror scenario, Melissa walksinto a conference room and sets her laptop in meeting mode. Her machinediscovers the projector in the conference room. She wirelessly projectsthe slide show on her laptop as-is on the projector. After she is donepresenting her slides, she disconnects from the projector for anothermeeting attendee to use the projector. Many examples are given herein,none of which should be considered limiting on the invention. Forinstance, the Extended scenario can be achieved in either of the 1:1 or1:n projection circumstances. The Mirror scenario can also be achievedin the 1:1 and 1:n projection circumstance, i.e., they are not exclusivescenarios.

In a typical Extended Monitor scenario, Patrick sets his laptop in themeeting mode as he enters the client's conference room. His machinediscovers the wireless projector in the room. By enabling the projectorto be used in an extended multi-monitor fashion, the projector projectsthe presentation, while Patrick's laptop shows his notes. Effectively,Patrick's display is disaggregated so it can be used as a secondmonitor.

In a typical 1:N scenario, Fred meets his colleagues at the airportlobby who all have laptops, or other computing devices, that includesoftware according to the invention, e.g., in the operating system, oras an application. As a result, Fred can easily project his slides onall his colleagues' laptops, and/or a projector, if one is available.

Thus, the solution of the invention represents a simple user interface(UI) that allows users to find available wireless projectors or othercomputers, make settings and connect to them. In addition, the inventionincludes a UI for the users of other computers to accept “projected”content/data from the source portable/mobile computer.

FIG. 3 illustrates an exemplary sequence for launching a wirelessprojection application in accordance with the invention. For instance,at 300, an exemplary user interaction for projection begins byinstantiating the software functionality of the invention. This mayhappen at startup of the device, or as part of initiating a projectionrequest. For a non limiting example, users can launch the invention viaa menu location under a start menu or a top level or easy to reach UI,such as a sidebar. At 310, the user sets the machine into “Presentation”mode. Presentation mode can affect other tasks that are invoked by theoperating system during a presentation, e.g., turn off notifications,turn off screen blanking, prevent audio from other sources, change powerscheme, change desktop background, etc. In a non-limiting embodiment notillustrated in FIG. 3, if a top level or easy to reach UI is availableand one or more displays are found, a display bar part appears. For thisto occur, the machine may be in discovery mode for a predeterminedamount of time, e.g., 30 seconds, after the Presentation mode has beenselected in order to give the invention time to discover existingdisplays for projection. At 320, the user is asked via the UI if hewants to project content. If “Yes”, the machine enters the discoverystate at 330. If no, then the software exits or returns to step 300, or310. At 340, a dialog box with a list of displays, e.g., projectors,appears. In one embodiment, with respect to other's laptops, thepresenter does not receive a list of laptop displays, but rather thepresenter creates a virtual meeting with meeting name/password forothers to use in order to join. At 350, the user picks a display, e.g.,projector to which to display content. In one embodiment, with respectto other's laptops, as above, the user does not select other's laptops,but rather creates a virtual meeting with meeting name/password forothers to use. Discovery could also potentially happen in the backgroundwithout any user intervention.

Although the discovery process may return all projectors and laptops,some may not be available for display, i.e., currently in use by anotherprojection. In accordance with the invention, these include anindication that they are in use, e.g., these are grayed out in thedisplay with a “busy” icon. As part of this dialog box, the user has theoption to select from the Most Recently Used (MRU) projector list or toenter the name of the projector directly, which may include specifying aURL or IP address, without the need to discover the projector. The useris also presented with the option to configure the projection.

Once the an alternate display, e.g., projector, has been selected,projection may begin. If available, a UI element, e.g., portion of thetop level or easy to reach UI, such as a sidebar, allows the user to:disconnect and/or add more people to the projection. For instance, inone embodiment, a flyout portion of the top level or easy to reach UI,such as a sidebar, allows a user to see who is in the presentation, andto potentially disconnect them, but not to add more. In this embodiment,if a user wants to be added, the user selects a presentation via themeeting name/password to join. A dialog box, e.g., display sidebar, thusshows status of projection, ability to disconnect and add more people tothe projection list.

The architecture of the invention is illustrated in FIGS. 4A and 4B.Conference room projector technology in accordance with the inventioncombines two key technologies: UPnP and Terminal Services. The use ofthese two technologies in accordance with the invention allow a user todiscover and remotely control a projector, project an application(Desktop, PowerPoint, etc.) and extend a desktop to a disaggregateddisplay device. FIGS. 4A and 4B show the overall architecture of themeeting room multimon (MRM) service in accordance with the invention. Atthe lowest level is the operating system on which the Universal Plug andPlay component UPnP and Terminal Services TS1 and TS2 and remoteassistance RA1 and RA2 components are built. MRM utilizes bothtechnologies in order to solve the problems addressed by the invention.Universal Plug and Play is used to discover and control the projectordevice. Terminal Services and remote assistance are used for the displayrendering.

FIGS. 4A and 4B also show how the invention includes two parts: one partis used for control (MRM Sender), while the other is actually used todisplay the Sender's screen.

The Sender (FIG. 4A) provides the functionality via a service SS thatcontrols and discovers the device. It does so using the mechanismsdefined by Universal Plug and Play. In addition, the Sender includes theTerminal Services server TS1. Via this server, the Sender's screeninformation is distributed to the Terminal Services Client TS2, i.e.,the alternate display device.

The control point of FIG. 4A discovers, controls, and projects to theConference Room Projector Device of FIG. 4B, which may include laptops,projectors, monitors, etc. A Conference Room Projector Device utilizesUniversal Plug and Play to advertise itself on the network. It uses theTerminal Services Client TS2 to “Connect” to the Terminal ServicesServer TS1 in the Control Point of FIG. 4A. It then receives theinformation describing the screen from the Terminal Services Server TS1.

FIG. 5 illustrates an exemplary flow diagram relating to the process forconnecting to an alternate display device. At 500, the Control Point (orMRM) discovers alternate display device(s). This can be achieved by: 1)issuing a Universal Plug and Play search for that particular device, inwhich case all devices of this type respond to the request, or 2) listenfor a device to advertise itself. Once the control point knows about theparticular device, it then downloads the device's service document at510.

Next, the sender and the device set up a connection between each other.At 520, a “ticket” is generated for the terminal services client bycalling the appropriate APIs in the Remote Assistance Layer. This ticketgives information on how to connect to the Sender, and the mode toconnect in (projection, extended desktop, show a specific application,etc). Next, at 530, the device's UPnP ProjectorService DS is called withthe ticket. In other words, the Sender sends the ticket to the device.The device then passes the ticket to the Remote Assistance Layer on OS2or other Receivers at 540. The ticket is decoded and handed to theTerminal Services client TS2 at 550. At 560, the Terminal ServicesClient TS2 connects to the server TS1 and establishes the connection. At570, the Sender's screen data is rendered on the device via RDP.

FIG. 6 illustrates an exemplary flow diagram relating to the process forcontrolling an alternate display device. Once a user connects to thealternate display device at 600, the alternate display device returns a“SessionToken” that identifies the connection of the individual at 610.At a given point in time, one individual “owns” the alternate displaydevice. In other words, initially there is only one individual tellingthe alternate display device what connection to project. In addition,this token is used for controlling the alternate display device. Withthis token, a user can: disconnect at 620, change/retrieve the displaysettings for their session at 630, transfer ownership at 640 and/or“blackout” their connection 650.

For a 1:1 projection, the projector control point utilizes an API, suchas the SALEM layer API, to generate the tickets for establishing aconnection. For a 1:N projection and other extended monitor projection,in one embodiment, the projector utilizes a communication andcollaboration API from the terminal services layer, allowing multipleclients to participate in a multi-shadowing session. The API alsoprovides a way to invite and un-invite clients into the shadowingsession. The purpose of the user control point is to display a list ofavailable alternate display device from which the user can select forconnection.

As described above, the invention provides the ability to discover aconference room projector in a wireless setting, the ability to projecta laptop display on a projector (mirror 1:1), the ability to project alaptop display on projector and/or to meeting attendees (1:m), even inthe absence of a WinCE based projector and the ability to have speakernotes on the laptop as well as slide show on the projector (extendedmulti-mon). As mentioned, the invention also provides User Interface(s)for ease of user interaction for projection and aspects of the userinterface mechanism(s) are now described in more detail.

In accordance with the invention, the user has the option to configurethe projection. A configuration UI can be launched from the “Options”button on a dialog box in accordance with the invention that allows theuser to any of: set a password for the projection, select cloning modevs. extended mode, select the screen resolution and select video, oraudio and video. In one embodiment, the system defaults to cloning mode,the screen resolution defaults to current system settings and “audio andvideo” is selected by default.

In one aspect, the user interface of the invention enables a user toindicate whether he wants to “project” or “allow others to project” tohis laptop. If the user selects “allow others to project”, the machineenters “available for discovery” state, i.e., the machine begins tobroadcast its availability, so that a host that is looking for availablealternate display devices receives an indication that the machine isavailable. Alternatively, if a user receives a notification from someonewanting to present to his/her laptop, the user is asked to accept. If“yes” is selected, and the projection is password protected, then theuser is asked to enter the password.

Once the projection has started, a client projection window appearswhich shows the projection. In one embodiment, the window includes twoinput elements (e.g., buttons)—one to disconnect, and the other forconfiguration. Configuration allows the user to turn off audio or letother people find the display, enabling the sender to discover otherpossible receivers for the content. With the disconnect button, thecurrent projection session is ended and the projection window isdismissed. In one non-limiting embodiment, the presenter is not notifiedof which users are viewing the projection. In another non-limitingembodiment, the pointer becomes a laser red dot during projection toallow the presenter an easy way to highlight an item on the projection.

FIGS. 7A-7H illustrate exemplary non-limiting screenshots of varioususer interface scenarios in accordance with the invention. FIG. 7Aillustrates an exemplary screen 700 a to be projected to an alternatedisplay device in accordance with the invention. FIG. 7B illustrates anexemplary screenshot 700 b wherein a user is asked about participatingin a meeting, as either a sender or a receiver. FIG. 7C illustrates anexemplary screenshot 700 c wherein a user selects alternate displaydevices from a list. FIG. 7D illustrates an exemplary screenshot 700 dwherein a user is presented with additional display options. FIG. 7Eillustrates an exemplary screenshot 700 e illustrating a projector barpart flyout scenario if a top level or easy to reach UI, such as asidebar, is available. FIG. 7F illustrates an exemplary screenshot 700 fshowing the projection view on the alternate display device, wherein thepointer device has become a laser light dot. FIG. 7G illustrates anexemplary screenshot 700 g wherein a meeting attendee is asked by thepresenter to participate. FIG. 7H illustrates an exemplary screenshot700 h wherein the user accepts and begins receiving a projection windowfor rendering the content of the projection.

When the service is configured to allow the user to project to adisplay, the service can be used to find registered UPnP projectordevices, query their current state, create a TS ticket to establish aconnection and disconnect from a session.

MRM does not need to interface with TS. In one embodiment, establishingthe connection is achieved through a UPnP API. Disconnecting andcontrolling the remote display utilizes the session token that isreturned from the connect call. Simply obtaining status information doesnot require the use of any session data on the projector. (e.g.Projector status, resolution, etc.)

Additionally, exposed UIs render to display under current devicesettings (e.g., DPI, Resolution). As a result, size remains consistentacross machines with different DPI and resolutions. UI is presented in amanner such that the user does not have to deal with any windowsmanagement issues in landscape and portrait orientations. Thus, invarious embodiments, the projected screen fits to the aspect ratio ofthe device.

The following is an exemplary non-limiting subset of methods utilized tosupport projection scenarios in accordance with an embodiment of theinvention.

(1) Connect ([in] BSTR bstrTicket, [in] BSTR bstrUser, [out, retval]BSTR *pbstrSession)

This method passes a Terminal Services ticket and the user's name to anapplication, which will attempt to establish a connection back to theoriginating machine. It returns a session string that can be used tocontrol the device. In one embodiment, if no one was using the device,the initial state will transition from 0 (Available), to 1 (Connecting)to 3 (InUse) as the connection is established. If the device was in use,it may not be immediately controlled by the user. In order to disconnectfrom the session, the Disconnect method is called with the sessionstring returned from this method.

(2) Disconnect ([in] BSTR bstrSession)

This method disconnects a session indicated by the string parameter.This value is the same as the string returned from the Connect method.In one embodiment, the state will transition from 3 (InUse) to 2(Disconnecting) and 0 (Available) as the connection is brought down andthe device reverts to its default settings.

Events for the following variables are raised after the internal valueshave been updated: A_CurrentUser, A_NextUser, A_UserCount andA_UserList. It is noted that TS-network-protocol has a feature calledauto-reconnect which allows the connection to be re-connected in theevent of a network loss.

(3) SetDisplayMode ([in] BSTR bstrSession, [in] long DisplayMode)

This method changes the display mode if the session parameter matchesthat of the user that is currently in control of the device.

(4) SetResolution ([in] BSTR bstrSession, [in] long width, [in] longheight, [in] long colorDepth)

This method sets the resolution for the session.

(5) GetUserName ([in] long position, [out] BSTR*pbstrUser)

This method retrieves the name of a user.

In one embodiment, with respect to properties, the followingnon-limiting functions are implemented:

(1) get_A_State([out, retval] long *pState)

This retrieves the current state of the device and in one embodiment,the valid values are:

DISPLAYSTATE_AVAILABLE=0,

DISPLAYSTATE_CONNECTING=1,

DISPLAYSTATE_DISCONNECTING=2,

DISPLAYSTATE_INUSE=3,

DISPLAYSTATE_INITIALIZING=4.

The default value is 0. Any value other than 0 indicates the device isbusy and no attempt is made to connect.

(2) get_A_DisplayMode([out, retval] long*pDisplayMode)

This retrieves the current display mode for the device.

(3) get_A_CurrentUser([out, retval] BSTR*pbstrUser)

This retrieves the current name of the current user who is in control.

(4) get_A_MaxUsers([out, retval] long*pcUsers)

This retrieves the maximum number of users the device can handle.

(5) get_A_Width([out, retval] long*pWidth)

This retrieves the current horizontal resolution. In one embodiment, thevalue can range from 800 to a variable MAXINT, which has a default valueof 1024. SetResolution can be used to change this value.

(6) get_A_Height([out, retval] long*pHeight)

This retrieves the current vertical resolution. In one embodiment, thevalue can range from 600 to MAXINT, which has a default value of 768.SetResolution can be used to change this value.

(7) get_A_ColorDepth([out, retval] long*pColorDepth)

This is the number of bits per pixel for the color. In one embodiment,this value can be one of: 8, 16, 24, 32. It has a default value of 32,and SetResolution can be used to change this value.

The invention may optionally be combined with a variety of existingaccessibility infrastructures and user interfaces. For instance, ifRobert has mobility impairment and does not have motor control below theneck, Robert probably uses an on-screen keyboard with an electronicpointing device to achieve his computing objectives, i.e., he is able touse the keyboard shortcuts, larger fonts to select projector displays.In one embodiment of the invention, therefore, the output of aprojection can be read via a screen reader. Thus, Robert is providedwith keyboard access to all features, especially mouse-intensiveactions, e.g., selecting projectors and laptop displays according to theinvention. Keyboard accelerators (e.g., key shortcuts) are also providedto menu items and controls. In one embodiment, logical keyboardnavigation order is used in dialog boxes and for similar groups ofobjects. In this sense, “logical” normally equals left to right, and topto bottom, which can change for international users depending upon thelanguage/culture.

In one embodiment, color alone is not used to differentiate betweenitems, ensuring that all information conveyed with color is alsoavailable without color. With respect to system settings, in variousembodiments, the invention supports control panel settings for colorswhere possible, otherwise allowing users to customize the color. Imagesare drawn using standard foreground and background colors. Also, whenthe high contrast flag is set via the Accessibility Control Panel,bitmapped images or other complex backgrounds behind text and controlsare omitted, images are drawn in monochrome instead of multiple colors,and application-specific colors are replaced with standard system colorsdefined through Control Panel, with the fewest possible colorcombinations used. Objects are drawn using the sizes (i.e., screenmetrics) selected in Control Panel. Also, if lines are drawn, the properwidth is determined rather than using a fixed value. Moreover, invarious embodiments, any custom controls include active accessibilityproperties.

Distance and obstructions can degrade wireless performance. Thus, invarious embodiments of the invention, an icon is displayed via the UImechanism(s) of the invention that indicates the signal quality. Apredetermined number of levels of signal quality can be showncorresponding to obstructions, distance and data rate to be maintained.

The invention may also be combined with international language andmultilingual user interface (MUI) techniques such that the content, whendelivered to a device owned by a foreign user, optionally will bedisplayed according to the language of the foreign user.

The projection of the invention, based on the presence on IP network,can be either wired or wireless. For instance, in a wired case, Josephis in his office (wired) and wants to project a slide deck to a guest inhis office, who has a laptop (connected either wired or wirelessly). Itis noted that the invention applies to any computing device, PC orotherwise, not just mobile devices.

In various embodiments, 1:1 projection includes discovery, connection tothe alternate display device and transmission of data. Discovery can beuser initiated or can be automatic in the background while the user isdoing some task, or the system is idle, etc. 1:1 projection can beeither extended or mirrored. In the extended case, there is a UI toenable one to navigate the presentation on the alternate display. Forinstance, one may have a PowerPoint presentation being presented on aprojector and one wants to go to the next slide while having speakernotes on the laptop screen. In this case, one can use a UI on the laptopscreen to highlight something on the slide or go to the next slide.Accordingly, the invention contemplates the scenario where there may besome portion of the sender's display (e.g., notes) that the sender doesnot wish to be seen on the rendering side, and also contemplates thescenario where there may be some portion of the sender's display notpart of the rendering side as part of the ordinary projection of data,but which is added to the projection so that it is apparent on therendering side.

In various embodiments, 1:n projection includes notification to thenetwork of an ongoing presentation. Rules can also be associated withthe presentation, which are modifiable/expandable. Examples of rulesinclude: (A) People who can join/view the presentation, (B) Password orany other authentication of the presentation, (C) Annotation of thepresentation on the viewer side and/or recordation/storage of theannotations and (D) Enforcement of Content Rights Management rules,e.g., the ability to enforce not taking a Print Screen of the slide.

Projection also includes the ability to broadcast the presence of apresentation on the network, but not to the people who are actually onthe network. Non UPnP based discovery can also be achieved in alternateembodiments. While discovery can be achieved via IP as described above,discovery can be achieved by means of any protocol, i.e., a machine canbe pinged directly to see if a presentation is occurring.

As part of the user experience, in one embodiment, users can enter a“View Presentation” mode and see a list of presentations going onthroughout the network. A receiver could also receive notificationsrelating to a presentation, e.g., a notification that a presentation isnearby or that someone specifically wishes to present to you.

The invention also includes the ability to transfer control of apresentation to another connected user, whereby any user can transfercontrol of the presentation to another person. As alluded to above,there can be administrative rights assigned by the person who owns thepresentation as to who can receive control of the presentation, and whatlevel of control, etc. The user experience that exposes the list ofpeople currently viewing the presentation includes the ability to add orremove someone, if authorized. The invention also contemplates theability to attend multiple presentations simultaneously with varyingdegrees of control, i.e., rules can be assigned per presentation.

The invention also includes the ability to combine 1:1 and 1:nprojection scenarios, where possible. Since alternate display devices,such as a projector, can have a queue of devices wanting to use thealternate display device for their respective presentations, theinvention includes a mechanism to manage the queuing of presentations bydevices. Ability for any application to start a mode in the presentationi.e. view or start a new presentation.

As mentioned, the invention includes the ability to configure what isactually presented, i.e., audio and video, audio only, or video only. Inone embodiment, the invention also includes “Laser Pointer”functionality, i.e., a user can temporarily highlight something in anongoing presentation during the presentation via an auxiliary inputmechanism corresponding to an auxiliary display effect, such as “laserpointing.” For instance, mouse movements may be converted to a mimic alaser pointer with trail.

In further embodiments, the invention provides systems and methods forcontrolling remote presentation of content with public and privateaspects. In this regard, the invention distinguishes between publiccontent of a presentation that is meant to be sent (i.e., remoted,broadcast or otherwise transmitted) to client devices (other laptops,projector, etc.) for display, and private content of a presentation thatis meant to preserve its functionality, e.g., be displayed, on theserver computing device from which the public content is being remoted.In one embodiment of the user interface of the invention, by default,content generated or altered previous to or concurrent with a publishingact, such as “printing” to the journal in the TabletPC context, ispublic content, and alterations (e.g., annotations, highlighting, otheradditions, masking of public content, deletions, etc.) to the contentmade after the publishing act form the basis for private content. Inanother embodiment of the user interface of the invention, a user cantake some action with respect to content, and designate some or all ofthe resulting content added, masked or removed by the action to beprivate. Consequently, during a content remoting experience, clientdevices display only the public content, while the private contentremains for display at the server device.

Advantageously, the presentation including the private content at theserver device remains synchronized with the display of the clientdevices, e.g., when a slideshow is being rendered, a change of slide atthe server device correspondingly changes the slide at the clientdevices. Also of advantage, the presenter is able to control the displayof the static public content sent to the client device(s) via the userinterface mechanism of the invention, while retaining the ability toview the private content on the server computing device (e.g., byinputting page up/page down or other similar commands for a PowerPointslideshow).

In this regard, when presenting content using software, such asPowerPoint, Journal, Excel, Word, XML, HTML, etc., the presentertypically has his or her back to the screen. For example, it can becumbersome to ensure that the audience is looking at the same materialthe presenter is speaking about, requiring the speaker to ask anotherperson to advance the public slide deck, or, if the speaker is advancingthe deck, the speaker must occasionally glance back at the screen toensure the deck is in the right spot, which can disrupt the flow of thepresentation. The invention thus remotely advances the publicpresentation of the deck as the speaker advances his/her privatepresentation on the computer. Accordingly, the invention advantageouslyenables the speaker to annotate a copy of the deck using thecapabilities of the computer, but when displayed to the public, only the“public” portions of the deck are displayed—private annotations arehidden from public view. For example, the speaker can annotate eachpresentation slide with ink indicating points he or she wants toemphasize or with additional talking points. When that slide deck isthen displayed (under control of the speaker's computing device), theremote control aspect of the invention ensures that public is looking atthe same slide as shown on the speaker's PC while the public-privateaspect of the invention hides the private annotations/alterations sothat only the public portions of the deck are displayed.

An exemplary slide 800 of a slideshow is illustrated in FIG. 8A.Exemplary public content 810 of the slideshow includes an “Agenda”heading and various talking points including “Introduction,” “CurrentStatus,” “Options for Consideration” and “Next Steps.” As with otherembodiments described herein, the presently described embodiments alsoenable the extension of content 810 from a computing device in thecontext of a presentation to a group of people, whether they are in thesame room or remotely dispersed. In one embodiment, a stylus typecomputing device, such as the TabletPC, is considered. For instance,stylus type computing devices are great tools for annotating documents,such as a slideshow presentation. Thus, as illustrated in FIG. 8B, slide800 including public content 810 may be annotated with speaker notes,drawings, video, photos, text or the like. As a non-limiting example,annotations 840 give cues to the speaker delivering the slideshow ofthings to address during delivery of the slide 800. For anothernon-limiting example, part of the slide 800 may be highlighted withhighlighting 830. In each of these cases, the speaker may wish only toremote the public content 810. Accordingly, in accordance with theinvention, in conjunction with performing an action, such as annotatingor highlighting, that alters the content, an author may designate theresults of the action to be private content such that the privatecontent will only be (optionally) displayed on the server device fromwhich the public content 810 is being remoted to client devices. Asmentioned above, default behavior may also specify which content ispublic and which content is private. For instance, once the content of aTabletPC is published to the Journal, the content comprises the publiccontent whereas, by default, subsequent alterations to the content maybe considered private. Thus, when the content (public and private) ofFIG. 8B is remoted to client devices, e.g., other laptops, projectors,etc., the client devices receive the view illustrated in FIG. 8A.

In another similar scenario illustrated in FIG. 8C, an author may wantto remove or mask detail from the public content 810, e.g., to abstractaway from the detail of the presentation. For instance, public content810 may include video, a photo or the like that the speaker would finddistracting during delivery of the presentation. Accordingly, asillustrated in FIG. 8C, an author may delete, or otherwise screen ormask, some of public content 810, and designate the erasure/masking 850as private, so that when the content (public and private) of FIG. 8C isremoted to client devices, the client devices receive the viewillustrated in FIG. 8A, whereas the server device will display the viewof FIG. 8C. Optionally, the presenter may turn the private/publicdistinction off, whereby client devices will also receive the privatecontent. Also, the presenter may also choose to view only the publiccontent (or only the private content).

Thus, the invention can be implemented in the context of a document tobe transmitted to alternate display devices, wherein the document can beconsidered to be two versions, i.e., a first version of the documentthat is public and a second version (different in some manner than thefirst version) that includes private content, wherein the privatecontent is represented by the delta between the first and secondversions (either additions or deletions). As mentioned, while theinvention is not limited thereto, stylus computing devices, such asTabletPC provide an exemplary environment for implementation of theinvention. For instance, TabletPC includes the ability to import filesinto a Journal (first version) whereby thereafter, the tablet pen can beused to annotate or otherwise alter the document images (secondversion). Files are imported into the Journal by “printing” them to theJournal. Reports, forms, presentations, spreadsheets, graphics, photos,Web pages, etc. can all be imported into the Journal. In this regard, ifthe document can be printed, it can be imported into the Journal andannotated without changing any of the original content of the importedfile. For instance, if one is en route to a meeting, one can import themeeting agenda, (e.g., a portable document format (pdf) file, wordprocessing document, spreadsheet, slideshow file, email file, etc.) intoJournal. Then, using the tablet pen, notes can be taken on the agenda ofitems being addressed. One's impressions of the document can thus besimply recorded and viewed. For example, one can project the content ofthe Tablet PC to the large-screen monitor in the conference room, importan image of the document into Journal and/or start putting comments onthe document image.

The Journal writer is a virtual printer that manages the import ofdocument images into Journal notes. Any program that lets you print canthus send the document to the Journal writer just as it would whenprinting to a physical printer. The Journal can then convert thedocument into a document image that is used as the background for aJournal note. In Journal, a document image can be created in at leastthree ways: by using the print command of a different program (useful ifthe file is open in another program), by using the Journal Importcommand (useful if you are working in Journal and want to import a file)and/or by using the drag-and-drop feature of search software such asWindows Explorer (useful for dragging a file directly into the Journal).Any file imported into Journal is imported into a new note as a set ofbackground images. The contents of these background images cannot bechanged in Journal, and accordingly, these background images are suitedto being the public content of the presentation sent to alternatedisplay devices in accordance with the invention.

There are multiple ways of implementing the present invention, e.g., anappropriate API, tool kit, driver code, operating system, control,standalone or downloadable software object, etc. which enablesapplications and services to use the wireless projection systems andmethods of the invention. The invention contemplates the use of theinvention from the standpoint of an API (or other software object), aswell as from a software or hardware object that receives content and/ormakes requests according to device discovery and content acceptance anddelivery protocols in accordance with the invention. Thus, variousimplementations of the invention described herein may have aspects thatare wholly in hardware, partly in hardware and partly in software, aswell as in software.

As mentioned above, while exemplary embodiments of the present inventionhave been described in connection with various computing devices andnetwork architectures, the underlying concepts may be applied to anycomputing device or system in which it is desirable to project contentto another device or receive projected content from another device. Forinstance, the algorithm(s) and hardware implementations of the inventionmay be applied to the operating system of a computing device, providedas a separate object on the device, as part of another object, as areusable control, as a downloadable object from a server, as a “middleman” between a device or object and the network, as a distributedobject, as hardware, in memory, a combination of any of the foregoing,etc. While exemplary programming languages, names and examples arechosen herein as representative of various choices, these languages,names and examples are not intended to be limiting. One of ordinaryskill in the art will appreciate that there are numerous ways ofproviding object code and nomenclature that achieves the same, similaror equivalent functionality achieved by the various embodiments of theinvention.

As mentioned, the various techniques described herein may be implementedin connection with hardware or software or, where appropriate, with acombination of both. Thus, the methods and apparatus of the presentinvention, or certain aspects or portions thereof, may take the form ofprogram code (i.e., instructions) embodied in tangible media, such asfloppy diskettes, CD-ROMs, hard drives, or any other machine-readablestorage medium, wherein, when the program code is loaded into andexecuted by a machine, such as a computer, the machine becomes anapparatus for practicing the invention. In the case of program codeexecution on programmable computers, the computing device generallyincludes a processor, a storage medium readable by the processor(including volatile and non-volatile memory and/or storage elements), atleast one input device, and at least one output device. One or moreprograms that may implement or utilize the wireless content projectiontechniques of the present invention, e.g., through the use of a dataprocessing API, reusable controls, or the like, are preferablyimplemented in a high level procedural or object oriented programminglanguage to communicate with a computer system. However, the program(s)can be implemented in assembly or machine language, if desired. In anycase, the language may be a compiled or interpreted language, andcombined with hardware implementations.

The methods and apparatus of the present invention may also be practicedvia communications embodied in the form of program code that istransmitted over some transmission medium, such as over electricalwiring or cabling, through fiber optics, or via any other form oftransmission, wherein, when the program code is received and loaded intoand executed by a machine, such as an EPROM, a gate array, aprogrammable logic device (PLD), a client computer, etc., the machinebecomes an apparatus for practicing the invention. When implemented on ageneral-purpose processor, the program code combines with the processorto provide a unique apparatus that operates to invoke the functionalityof the present invention. Additionally, any storage techniques used inconnection with the present invention may invariably be a combination ofhardware and software.

While the present invention has been described in connection with thepreferred embodiments of the various figures, it is to be understoodthat other similar embodiments may be used or modifications andadditions may be made to the described embodiment for performing thesame function of the present invention without deviating therefrom. Forexample, while exemplary network environments of the invention aredescribed in the context of a networked environment, such as a peer topeer networked environment, one skilled in the art will recognize thatthe present invention is not limited thereto, and that the methods, asdescribed in the present application may apply to any computing deviceor environment, such as a gaming console, handheld computer, portablecomputer, etc., whether wired or wireless, and may be applied to anynumber of such computing devices connected via a communications network,and interacting across the network. Furthermore, it should be emphasizedthat a variety of computer platforms, including handheld deviceoperating systems and other application specific operating systems arecontemplated, especially as the number of wireless networked devicescontinues to proliferate.

While exemplary embodiments refer to utilizing the present invention inthe context of laptops and projectors, the invention is not so limited,but rather may be implemented to provide wireless delivery of contentfrom any one computing device including the functionality of theinvention to one or more other computing devices also includingfunctionality according to the invention. Moreover, the source computingdevice need not even independently have a display. For instance, with amobile storage device with minimal processing resources, content may bedelivered from the mobile storage device to an alternate display deviceaccording to the invention without independent display capabilities.Still further, the present invention may be implemented in or across aplurality of processing chips or devices, and storage may similarly beeffected across a plurality of devices. Therefore, the present inventionshould not be limited to any single embodiment, but rather should beconstrued in breadth and scope in accordance with the appended claims.

1. A method for projecting content from a sender device to an alternatedisplay device, the method comprising: discovering in the sender device,at least one of a plurality of alternate display devices by using ameeting room multimon (MRM) service comprising one of (A) a wirelessUniversal Plug and Play (UPnP) search or (B) listening for a wirelessadvertisement emitted by the at least one of the plurality of alternatedisplay devices; establishing a remote session, via a remoting protocol,between the sender device and the at least one alternate display device,the establishing comprising: receiving in the sender device, a servicedocument of the at least one alternate display device; generating in thesender device, a ticket that provides information on a) how to connectto the sender device and b) which one amongst a plurality of projectionmodes is to be used; and sending the ticket from the sender device tothe at least one alternate display device; and transmitting from thesender device to the at least one alternate display device, said contentthat is rendered thereon, on the at least one alternate display device.2. A method according to claim 1, wherein the remoting protocol is theremote desktop protocol and the remote session is a terminal services(TS) session.
 3. A method according to claim 1, further comprisingauthoring said content.
 4. A method according to claim 3, furthercomprising publishing said content.
 5. A method according to claim 4,wherein content authored before said publishing comprises privatecontent and public content.
 6. A method according to claim 3, whereinsaid authoring includes designating via a second user interfacemechanism at least one portion of the content as private content.
 7. Amethod according to claim 6, wherein said authoring includes designatingat least one alteration of said public content as private content.
 8. Amethod according to claim 7, wherein said authoring includes designatingat least one of a masking, a deletion, an annotation and a highlightingof said content as private content.
 9. A method according to claim 1,wherein the content is substantially simultaneously displayed on the atleast one alternate display device in response to said transmitting. 10.A method according to claim 1, further comprising controlling thedisplay of a public portion of the content, on said at least onealternate display device via a second user interface mechanism on saidsender device.
 11. A method according to claim 10, wherein saidcontrolling includes controlling a rate of viewing of said content viaat least one input device of said sender device.
 12. A method accordingto claim 1, wherein said content is a slide presentation.
 13. A methodaccording to claim 1, further including, for each remote session betweenthe sender device and the at least one alternate display device,displaying via a second user interface mechanism an indication of asignal strength associated with the remote session.
 14. A methodaccording to claim 1, wherein said transmitting includes transmittingonly a public portion of said content, to the at least one alternatedisplay device.
 15. A computer readable storage medium comprisingcomputer executable modules having computer executable instructions forcarrying out the method of claim
 1. 16. A computing device comprisingmeans for performing the method of claim
 1. 17. A computer readablestorage medium comprising computer executable instructions forimplementing a method of interfacing with a user of a computing devicehaving content including at least one public portion and at least oneprivate portion capable of being projected to other computing devices,the method comprising: displaying a user interface on the computingdevice; selecting via the user interface the content including the atleast one public portion; establishing a remote session, via a remotingprotocol, between the computing device and at least one of the othercomputing devices, the establishing comprising: generating in thecomputing device, a ticket that provides information on a) how toconnect to the computing device and b) which one amongst a plurality ofprojection modes is to be used; and sending the ticket from thecomputing device to the at least one of the other computing devices; andvia said user interface, transmitting at least said at least one publicportion of the selected content to the other computing devices, wherebywhen said content is rendered on at least one of the other computingdevices, only the at least one public portion is rendered.
 18. Acomputer readable storage medium according to claim 17, furthercomprising generating a first content version including the at least onepublic portion and altering said first content version thereby forming asecond content version, whereby the difference in display between saidfirst and second content versions comprises said at least one privateportion.
 19. A computer readable storage medium according to claim 18,wherein said generating includes publishing said at least one publicportion.
 20. A computer readable storage medium according to claim 19,wherein said computing device is a stylus pen input device and saidpublishing includes printing said at least one public portion to ajournal.
 21. A computer readable storage medium according to claim 18,wherein said altering includes at least one of adding to, masking,highlighting, annotating and deleting from said first content version.22. A computer readable storage medium according to claim 17, furthercomprising using a session token for controlling the at least one of theother computing devices.
 23. A computer readable storage mediumaccording to claim 17, further comprising placing said computing devicein an “available for discovery” state.
 24. A computer readable storagemedium according to claim 17, further comprising displaying a clientprojection window which shows said at least one public portion.
 25. Acomputer readable storage medium according to claim 17, furthercomprising rendering said at least one private portion and said at leastone public portion on said computing device, whereby in response to saidtransmitting, the at least one public portion rendered on said at leastone of the other computing devices is rendered substantiallysimultaneously with said at least one public portion and said at leastone private portion rendered on said computing device.
 26. A computerreadable storage medium according to claim 17, further comprisingcontrolling the rendering of the at least one public portion on said atleast one of the other computing devices via said user interface.
 27. Acomputer readable storage medium according to claim 26, wherein saidcontrolling includes controlling a rate of viewing of said at least onepublic portion via at least one input device of said computing device.28. A computer readable storage medium according to claim 26, whereinsaid controlling correspondingly controls rendering of said at least onepublic portion and said at least one private portion on said computingdevice.
 29. A computer readable storage medium according to claim 17,wherein said transmitting comprises utilizing a communication andcollaboration API for operating a multi-shadowing session whereby a 1:Nprojection is carried out upon N other computing devices.
 30. A computerreadable storage medium according to claim 17, wherein the othercomputing devices include at least one of (A) at least one projectordevice and (B) at least one available other notebook computer.